Thursday, May 9, 2013

What are We Building along Calaveras Road?

Those who frequently travel on Calaveras Road in the Sunol Valley will likely notice increased activity along the west side of Calaveras Road, south of Interstate 680 (I-680). It is, in fact, the latest Water System Improvement Program Project to begin construction in the Sunol Valley - the San Antonio Backup Pipeline Project. Construction officially began in April, and the contractor, Ranger Pipelines Inc., has begun mobilization activities.

What are we building?
  • Approximately 1.3 miles of 5 ½ foot diameter pipeline
  • New chemical storage, feed, and equipment facilities
  • A new cut-off wall around one of the quarry pits located just south of I-680.
  • The contractor will also complete upgrades to the water delivery pipeline that serves the Town of Sunol.
What to Expect
  • Trucks entering and exiting the project driveway site, along Calaveras Road approximately 1/3 of a mile south of I-680 along Calaveras Road.
  • Intermittent delays are possible during construction on Calaveras Road.
  • Please proceed with caution when travelling through construction zones.
  • Additional construction activity on the west side of Calaveras Road.
  • All construction activities will occur on SFPUC-owned property.

Project Location Map
Alignment for San Antonio Backup Pipeline is in red.
Work Hours
  • Monday – Friday: 7:00 a.m. to 5:00 p.m.
  • No planned work on weekends or holidays.
Why are we building this?
Two-way traffic is better, at least in the case of the San Francisco Public Utilities Commission’s (SFPUC) San Antonio Pipeline. The existing San Antonio Pipeline acts as a water transmission pathway in the Sunol Valley. This pipeline allows us to discharge Hetch Hetchy water to San Antonio Reservoir for storage and send reservoir water to the Sunol Valley Water Treatment Plant for treatment before distribution to customers. The problem is that there is currently only one pipeline, so water can only move in one direction at a time.

When complete in 2015, the San Antonio Backup Pipeline will enable the SFPUC to discharge Hetch Hetchy water to a nearby quarry pit during emergency events while at the same transporting San Antonio Reservoir Water to the Treatment Plant at the same time. This adds operational flexibility to the system and minimizes the risk of service disruption to 2.6 million customers.

See you around the Sunol Valley!

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